IMac 20" Core Duo - Buzzes When Running on APC BX900 Back-UPS

I pulled the plug on my APC BX900 UPS to test it, and all went fine (it showed 53 minutes remaining). I noticed though that during the 2 minutes I had the plug out of the wall (and the UPS battery was powering the iMac), I heard a buzzing coming from the iMac (sounded like it was from near the top left rear corner somewhere). As soon as I put the UPS plug back in the wall, and it switched to line power, the buzzing stopped. I suspect this may be due to the modified sine-wave that is produced when running from battery, and that the buzzing is associated with power supply components in the iMac. But, should I be concerned that during the (hopefully) few times this thing might kick into battery backup mode it's going to fry my iMac? I see very few confirmed reports of any such damage, and yes, I know a Smart-UPS (with sine wave output) would be preferrable, but if what I described is acceptable, and just purely a nuisance, I'll live with it. On the other hand, I don't want to melt this thing down trying to protect it. Thanks!
Mark

Thanks Eric. I'm not quite ready to assume the UPS is defective, although I agree it's a possibility. I have had other users in other forums report the same or similar buzzing, so I am inclined to believe my scenario is not unique. Then again, all of us "buzzers" may have defective UPS's.
I do have an APC BX1000 on another machine here at home (a Gateway PC), and I could swap them . . . what a maze of wires, etc, though. I'd prefer to avoid that too, but that might be my best course of action. Thanks again.
Mark

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